4 files changed, 24 insertions, 7 deletions
diff --git a/erts/emulator/beam/erl_alloc.c b/erts/emulator/beam/erl_alloc.c
index 5544712e8d..e7523ac989 100644
--- a/erts/emulator/beam/erl_alloc.c
+++ b/erts/emulator/beam/erl_alloc.c
@@ -968,6 +968,10 @@ set_au_allocator(ErtsAlcType_t alctr_n, struct au_init *init, int ncpu)
     else
 #endif
     {
+#ifdef ERTS_SMP
+        erl_exit(ERTS_ABORT_EXIT, "%salloc is not thread safe\n",
+                 init->init.util.name_prefix);
+#else
 	af->alloc = erts_alcu_alloc;
 	if (init->init.util.fix_type_size)
 	    af->realloc = erts_realloc_fixed_size;
@@ -976,6 +980,7 @@ set_au_allocator(ErtsAlcType_t alctr_n, struct au_init *init, int ncpu)
 	else
 	    af->realloc = erts_alcu_realloc;
 	af->free = erts_alcu_free;
+#endif
     }
     af->extra	= NULL;
     ai->alloc_util	= 1;
@@ -3402,8 +3407,11 @@ UWord erts_alc_test(UWord op, UWord a1, UWord a2, UWord a3)
 	    init.enable = 1;
 	    init.atype = GOODFIT;
 	    init.init.util.name_prefix = (char *) a1;
-	    init.init.util.ts = a2 ? 1 : 0;
-
+#ifdef ERTS_SMP
+	    init.init.util.ts = 1;
+#else
+            init.init.util.ts = a2 ? 1 : 0;
+#endif
 	    if ((char **) a3) {
 		char **argv = (char **) a3;
 		int i = 0;
diff --git a/erts/emulator/beam/erl_alloc_util.c b/erts/emulator/beam/erl_alloc_util.c
index eedfd1e13d..3230b6ef34 100644
--- a/erts/emulator/beam/erl_alloc_util.c
+++ b/erts/emulator/beam/erl_alloc_util.c
@@ -5337,6 +5337,11 @@ do_erts_alcu_alloc(ErtsAlcType_t type, void *extra, Uint size)
 void *erts_alcu_alloc(ErtsAlcType_t type, void *extra, Uint size)
 {
     void *res;
+#ifdef ERTS_SMP
+    ASSERT(!"This is not thread safe");
+#elif defined(USE_THREADS)
+    ASSERT(erts_equal_tids(erts_main_thread, erts_thr_self()));
+#endif
     res = do_erts_alcu_alloc(type, extra, size);
     DEBUG_CHECK_ALIGNMENT(res);
     return res;
diff --git a/erts/emulator/beam/erl_init.c b/erts/emulator/beam/erl_init.c
index 42aca726bf..39957eb58b 100644
--- a/erts/emulator/beam/erl_init.c
+++ b/erts/emulator/beam/erl_init.c
@@ -152,7 +152,7 @@ volatile int erts_writing_erl_crash_dump = 0;
 int erts_initialized = 0;
 
 #if defined(USE_THREADS) && !defined(ERTS_SMP)
-static erts_tid_t main_thread;
+erts_tid_t erts_main_thread;
 #endif
 
 int erts_use_sender_punish;
@@ -744,6 +744,10 @@ early_init(int *argc, char **argv) /*
     char envbuf[21]; /* enough for any 64-bit integer */
     size_t envbufsz;
 
+#if defined(USE_THREADS) && !defined(ERTS_SMP)
+    erts_main_thread = erts_thr_self();
+#endif
+
     erts_save_emu_args(*argc, argv);
 
     erts_sched_compact_load = 1;
@@ -797,9 +801,6 @@ early_init(int *argc, char **argv) /*
 			       (erts_aint32_t) ((Uint16) -1));
 
     erts_pre_init_process();
-#if defined(USE_THREADS) && !defined(ERTS_SMP)
-    main_thread = erts_thr_self();
-#endif
 
     /*
      * We need to know the number of schedulers to use before we
@@ -2285,7 +2286,7 @@ system_cleanup(int flush_async)
     if (!flush_async
 	|| !erts_initialized
 #if defined(USE_THREADS) && !defined(ERTS_SMP)
-	|| !erts_equal_tids(main_thread, erts_thr_self())
+	|| !erts_equal_tids(erts_main_thread, erts_thr_self())
 #endif
 	)
 	return;
diff --git a/erts/emulator/beam/global.h b/erts/emulator/beam/global.h
index 3f5925765d..ad9fdfc878 100644
--- a/erts/emulator/beam/global.h
+++ b/erts/emulator/beam/global.h
@@ -1168,6 +1168,9 @@ extern ErtsModifiedTimings erts_modified_timings[];
 extern int erts_no_line_info;
 extern Eterm erts_error_logger_warnings;
 extern int erts_initialized;
+#if defined(USE_THREADS) && !defined(ERTS_SMP)
+extern erts_tid_t erts_main_thread;
+#endif
 extern int erts_compat_rel;
 extern int erts_use_sender_punish;
 void erts_short_init(void);